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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 04-27-2008, 05:22 PM   #21
AdamBath
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Good to know. Well if this can be accomplished with headers......






I was afraid of that. Well, it sounds like it's going to be a trial & error scenario on the headers passing emissions. Being that I just registered my plates, I have some time to get them and hopefully figure out any issues relating to codes (see above quote.)
you could also keep your stock manifolds and get really good at swapping back and forth once a year.
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Old 04-27-2008, 05:27 PM   #22
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you could also keep your stock manifolds and get really good at swapping back and forth once a year.
If I had the space to accomplish it, but you are right...it would be good practice.



Alright, sounds like Headers, Cams, Diff will provide the greatest impacts. I'll weigh on those items.
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Old 04-27-2008, 05:29 PM   #23
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If I had the space to accomplish it, but you are right...it would be good practice.



Alright, sounds like Headers, Cams, Diff will provide the greatest impacts. I'll weigh on those items.
the stock manifolds can easily fit in a closet
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Old 04-27-2008, 05:51 PM   #24
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I think there's no way they would pass emissions tests here in NC. I'll have to ask around to guys with racing cats (on non BMW cars) to see how in the heck they get away with it, lol.

No problems passing emission testing for last 2 years including headers and high-flow cats here in Eastern NC. Only the OBDII computer check needs to pass; they don't really enforce visual checks around here.
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Old 04-27-2008, 08:11 PM   #25
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The stock headers are very restrictive, so even with ebay headers and 300cell instead of 200cell cats you would have a gain, and decreased temperatures in the engine bay.
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Old 04-27-2008, 10:54 PM   #26
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No problems passing emission testing for last 2 years including headers and high-flow cats here in Eastern NC. Only the OBDII computer check needs to pass; they don't really enforce visual checks around here.
Well, good stuff to know!

Is there a Db level the exhaust must meet?

I may have to head east and check out your supercharger setup.
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